Method of and means for making core lamine



Dec. 2o, 1927. 1,653,152

. J. C. DALEY METHOD OF AND MEANS FOR MAKING COREv LAMINAS Filed Nov. A6, 1926 s sheets-sheet l JAW@ wz@ @www vfluu] my W45 Dec. 20, 192 7.

J. C. DALEY METHOD 0F AND MEANS FOR MAKING CORE LAMINZE F'iley Nov. 6. 1926 3 Sheets-Sheet 2 Dec. 2o, 1927. 1,653,152

J. C. DALEY METHOD OF AND MENS FOR MAKING CORE LAMIN E Filed Nov. s, 192e s sheets-sheet s (diff/65:5 65,' 6

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' Fatented Dec.; 2o, 1921.

UNITED 'STATES JAMES C. DAILILY,l F CHICAGO, ILLINOIS, ASSIGNOR TO JEFFERSONI ELECTRIC I ,PATENT oFFic/E.

MANUFACTURING COMPANY, 0F CHICAGO, ILLINOIS, A COR'POIIELA'IITION 0F ILLINOIS.

METHOD 0F AND MEANS FOR MAKING CORE LAMINZE.

Application 1e`d. 1}1'ovember 6, 1926. Serial No. 146,826.

This .invention relates to the manufacture,

of 'laminated' transformer cores and the like,

and its object is to provide an improved method of and`means for bla-nking or punching out the laminae at an increased rate `and with a minimum of waste.

The invention provides an improved method and imp roved die means for punching or blanking the laminae and improved means for aligning the' strip of material and holding it aligned as the laminaeare punched or blanked therefrom.

The laminae may be made of sheet iron or any other suitable or preferred material, and the method andy means which I provide enables producing same in large quantities expeditiously, quickly ,and economically and, as already pointed out, with little waste.

The invention is illustrated in the accompanying drawings'in which Fig. 1 is a top plan View and die block;

Fig. 2 is a bottom view of thel upper punch and punch holder;

Fig. 3" is' a vertical longitudinal section through the upper and lower dies and die blocks, taken on theline 3--3 of Fig. 1;y

Fig. et is Va vertical. transverse section through blocks taken on the line 4 -4 of Fig. 1;

Fig. 5 is a fragmentary perspective view 'of the end of the strip of material which` is first presented to the die means, showing the aligning holes' which are yfirst punched therein:l

Fig. 6 is a similar view showing the strip of material after thel first laminae punching step as it is initially fed betweenthe dies of the press, the manner ofv punching the laminae from the material by the' next and succeeding punching and blanking steps being shown in dotted lines;

Fig. 7 is anothersimilar View showing the strip of material yafter the punching and blanking steps shown in dotted lines in Fig. 6; and y Fig. 8 is a perspective view of-v one of the laminae formed by the method and means of my present invention.

Referring to the drawings, each of the corepieces or laminae 5 (Fig. 8) is of general E formation, having. a base 6 and three parallel legs 7, 8 and 9 extending parallel with y each other Vand at substantially right angles of the lower die the upper and lower dies and diel i. Fig. 1 between to the base 6. The laminae or pieces 5 are identical and match each other in contour 8f and 9 upon each other and the bases .6

alternately at opposite ends. wound around the intermediate legs 8 and through the 4spaces between them and the outer legs 7 and 9, the central or intermediate legs 8 forming the core proper for carryingf the flux through the coil while the about the coil. The free endsI of the intermediate legs 8 are notched at 10 and the free edges of the bases 6 are similarly notched at 12 for purposes of assembly, the notches 12 'being disposed centrally of the bases 6 and in longitudinal alignment with the notches 10.

ln producing or making the core pieces or laminae 5 l employ strips 15 of suitable material. iVhere the laminae are to be used for making transformer. cores, or the like, as herein disclosed, they are preferably formed from strips of suitable sheet iron, although of course any other suitable or preferred material may be employed. The strips 15 of material are preferably substantially fiat and may, of course, be of any suitable or preferred gauge or thickness. They may" 'in practice .be punched cold;

For thepurpose of punching or stamping the laminae, the strip 15 is fed by suitable meansdesignated diagrammatically at 16 in the upper and lower dies 18 and 20 of a suitable press, the strip 15 being suitably guided and fedfover the lower die 20.

"The lower die 2() comprises a die block or plate25 which mayy be suitably fastened do-wn upon the bed of the press or other support. it or otherwise in the opening 27 in the die block 25, isfthelower die proper 26. The die 26 is provided with the E-shaped die openings 28', 29 and 30 and with two oblong openings 32 and 34,all preferably L"bounded The coil is` Suitably secured as by a pressedv 'outer legs 7 and 9 and bases 6 formthe yoke.

by relatively sharp cutting or shearing- TheI ' of a plurality of strips and blocks Yassembled in block to form the openings 28, 29, 30, 32 and 34. In practice it is usually desirable to avoid angular pieces in making upy the die proper and to mak-e the die up at least as completely as possible of oblong ieces so that annular cuttinfr ed es and.

a c; a

corners are avoided.

`'llhe strip of material 15 is fed between the die members 18 and 20 .in the direction .indicated by the arrow in Figs. 1 and 3. The E-shaped die openings 28, 29 and 30 are identical with each other and with the E- shaped laminas which it is desired to punch, the opening 39 being inverted with respect to the openings 28 and 29 with its base disposed centrally .adjacent the bases of the openings 28 and 29. The opening 30 is disposed centrally of the openings 28 and 29 on the side of the die over which the strip of material 15 travels first in its movement` between the dies. IThe bases of the openings 28 and 29 are in alignmentv and extend transversely across the path of travel of the strip 15 and the legs of these openings 28 and 29 are all parallel with -each other and extend in the direction offeed or travel of the strip 15. The space 36 between the inner legs of the openings 28 and 29 is of a width equal to the width of the middle legs 8 of the lamin 5 and the base of the opening extends transversely across the path or travel of the stock 5 parallel with' and adjacent the bases of the openings 28 and 29, but spaced therefrom slightly at 38 to allow a slight transverse retention therebetween as the laminae are punched from the material.

The middle leg of the die .opening 30 is aligned with the strip of material 36 between the openings 28 and 29 and is of the same width as the strip of material 36. extending from the base of the opening 3()y in adirection opposite the direction of movement Vof the stripl between the dies. The legs of the openings 28, 29 and. 30 are all parallel with each other and with the path Vof travel of the strip 15, and they extend longitudinally thereof and longitudinally of the die members. The strips of material and -42 between the legs of the opening 30 (Fig. 1) are .aligned longitudinally one with eachof the inner legs of the openings 28 and 29, and their width is the same as the Width of the inner legs of the openings 28 and 29.

The oblong openings 32- and 34 are also parallel with the legs of the openings 28, 29'and 30 and with the direction of movement ofthe strip 15, and they terminate at 'one end in alignment with the ends of the width ofthe central legs 8 of the lamina-2,

the strips of material forming these spaces 43 and 44 being equal in width with the central leg portions of the openings 28 and 29 and aligned longitudinally therewith. The ends .of the openings 32 and 34 toward the openings 28 and 29 extend slightly past the bases ofthe spaces between the legs oi the opening 30 as viewed transversely across the die. The width of each ot' the openings 32 and 34 is equal to the width of the spaces 45 and .46 between the central and outer legs of the openings 28 and 29, respectively, and are aligned longitudinally therewith.

The outer legs of the opening 3() are each et' the same width as the strips or' material forming the spaces 48 and 50 between the central and inner legs of the openings 28 and 29 and are aligned longitudinally therewith. rlihe outer legs of each of the laminae are, in the embodiment of the invention shown, of the same width and the spaces between the central and outer legs are of substantially of the `same width as these outer legs. The bases of the openings 28, 29 and 30 have lips or tongues53 and the outer ends of the central legslof these openings have The cooperating upper die 18 or punch isf reciprocable up and down and into and out or' the lowendie openings 28, 29, 30, 32 and 34. lt' comprises a block 60 in which the upper ends of the upper die member 62 are suitably secured at 63, and this block 60 is,

in turn,secured by screws 64 to a block or head member 65 which may be mounted in a suitable punch head or holder for vertical reciprocation. three E-sha'ped die parts 67, 68 and,69 which fit in the die openings 28. 29 and 30 of the lower die for up and down movementinto and out of said openings and the oblong die parts 70 and 72 which fit in the lower die openings 32 and 34 for up and down movement into and out or" the openings 32 and 34. The die parts 67, 68 and 69 have notches 74 for cooperation with 'the tongues or lips '53 and 54 or' the openings 28, 29 and. 30 of the lower die.

F or holding the strip aligned between the dies and punching aligning holes,v in the strip as it is fed therebetween, the upper die 18 has a pair of transversely aligned punch pinsor posts 76 transversely aligned at its forward end with one in longitudinal alignment with each of the oblong openings '32 and 34. 'Ijhese pins 76 kare secured at their upper ends at 78 in the block 60 and the lower die 26 has registering holes 80 for re- The die 62 comprises the ceiving the punch `pins 76 as the upper die is depressed into punching cooperation with the lower die. Between the'upper die parts 68 and 70 and 67 and 72 and rearwardly of the die parts 67 and 68, are four aligning and holding pins 82 aligned transversely in pairs with two in longitudinal alignment with each of the punch pins 76. The lower ends of the aligning and holding pins 82 are preferably tapered as shown in Figs. 8 and 4, and these pins are mounted at their upper ends in the blocks and 65 to yield vertically therein. For this purpose they may be passed through sleeves in the block 70 with their upper headed ends disposed in the openings 85 in the block 65 and springs 86 interposed between theupper headed ends and suitable plugs 87 and normally forcing or urging the pins 82 downwardly.

In punching the laminae the strip 15 is first fed in just sufficiently to dispose its inner end between the punch pins 76 and cooperating punch openings 80, whereupon the upper die is depressed into cooperation with the lower die and the pins 76 punch the two openings 90, as shown in Fig. 5, The dies' are thereupon separated and the feeding mechanism 16 then functions to feed the strip 15 a distance equal to the distance from the vertical axes of the punch pin 76 to the vertical axes of the vforward aligning and holding pins 82, this distance being equal to the distance between the axes of the forward pins 82 and theaxes of the rear pins 82.

This movement of the strip 15 registers the openings 90 with the forward aligning and holding pins 82 and upon the next successive operation of the dies or stroke of the I press the pins'82, by depending below the 4o upper die parts, first engage in the openings 90 and align the strip and hold it/aligned and as the upper die is brought into cooperation with the lower die, the E-shaped opening 92 and oblong side openings 93 and 94 gre stamped from the strip as shown in The following separation of the die members releases the strip and it is again fed an equaldisvtance, registering the openings 90 with the rear aligning and holding pins 82 and the openings 95 which are punched with the openings 92, 93 and. 94 are registered v with the front aligning and holding pins 82.

The material stamped from the opening 92 forms one of the E-shaped laminae and the material 9.6 and 97 between the cent-ral and j side legs of the opening 92 forms the inner legs of the laminae designated in dotted lines at 100 and 102 in Fig. 6 which are punched upon the succeeding stroke of the press. As the initial aligning openings 90 reach the rear aligning and holding pins 82, the next and all succeeding operations of the press upon the particular strip 15 punch the three laminas 100, 102 and 104 (Fig. 6) and the openings 107 and 108 together with the aligning openings 95 from the strip of material. Y

Thus, as soon as the between the dies, there is produced on each operation of the press three complete core laminae substantially identical in contour, not only with each other, but also with the core lainin produced on the succeeding operations of the machine. The inner legs of the laminae 100 and 102 interlock transversely between the legs of the previously punched laminae from the opening 92, and the material 97 and 98 left between the legs of the opening 92 on the preceding punching forms the inner legs of the laminze 100 and 102 on the succeeding punching. The openings 98 and 94 remove the material between the outer legs of the laminas 100 and 102. The material between the opposite sides of the opening 922 and the openings 98 and 94 forms the center tongues of the laminee 100 andv102 and the material outwardly of the openings 93 and 94 forms the outer tongues or legs of these laminas.

The strips of material 15 employed are preferably of a width slightly greater than the transverse, distance from the outer edge of the die opening 28 to the outer edge of the die opening 2.9 so that as the laminas are punched or stamped from the material narrow longitudinal retention margins 115 are left as'sliown-in Fig. 7, these margins 115 and the transverse strips 116 and the slightly enlarged square portions 118 formed at the` end of the central leg of the central opening 92 and at the ends of the central and outer legs of the laminae 100 and 102, together with the oblong strips from the openings 32 .and 34 constituting the only waste material in the production of the laminae from the strip 15. The present invention lends itself to the production of the laininae in large quantities, expeditiously, quickly and economically and with little waste, and such little waste as there is forms retention .for holding the strip together after the laminas have been stamped therefrom so that it may be fed from the machine and removed from between the dies by its feeding movement therebetween.

I claim 1.v The method of producing substantially similar E-shaped core laminas which' comprises feeding a metallic strip between the dies of a press, simultaneously punching upon the successive strokes of the press three E-shaped laminae with their bases across the path of movement of the strip and their legs parallel with said path of movement and with the legs of twol of the laniinae interlocking transversely with the legs of the opening formed in punching the third lamination on the preceding stroke of the press.

ica

2. The method of produ'cing substantially similar E-shaped core laminas which comprises feeding a metallic strip between the dies of a press, simultaneously punching upon the successive strokes of the press three E-shaped laminas with their bases across the path of movement of the strip, their legs parallel'with said path of movement and one inverted relative the other ltwo and the legs of the other two laminae interlocking transversely with the legs of the opening`V formed in punching the other inverted laminae on the preceding stroke of the press. y

3. The method of producing substantially similar Eshaped core laminae which comy prises feeding a metallic strip between the dies of a. press, simultaneously punching upon the successive strokes of the press three E-shaped laminae with one inverted and base to base with they other two and with their legs parallel the direction of feed ofthe strip and between the strokes of thepress advancing the strip to position the material left between the legs of the one inverted lamination in position to form one of the legs of each of the other two laminas upon the succeeding stroke .of the press.

4. rlhe method of-pro-ducing substantially similar E-shaped core laminae whichA comprises feeding a metallic strip between the dies of a press, simultaneously punching upon the successive strokes of the press three E-shaped laminas with one inverted and base to base with the other two and two oblong openings, one on each of the opposite sides of the one inverted lamination and between the strokes of the press, advancing the strip to position the material left between the legs of the one inverted lamination in position to form one of the legs o f each of the other two laminae, and the material on opposite sides of the oblongl opening forming the other two legs of each of the other two lamivan nac upon the succeeding stroke, ofthe press.

5. The method of making core laminas which comprises feeding a metallic strip between the dies of a press and simultaneously punching upon they successive strokes of the press three laminas with one having two spaces forming one of the tongues of each of the other two laminae punched on the suc ceeding stroke of the press.

6. The -method of making core laminas which comprises feeding a metallic strip between the dies of a press and simultaneously punching upon the successive strokes of the press three laminae with one having two spaces forming one of the tongues of each of the other two and three legs forming one of the spaces between the legsof each of the other two laminae and the space between the other two laminae punched on the succeeding stroke of the press.

7. The method of making core laminae4 which comprises feeding a metallic strip between the dies of a press and punching upon stroke of thev press, and simultaneously.

punching oblong openings on opposite sides of onel of the laminas for forming the other space between the legs of each of the other two laminee.

with their legs spaced transversely across the strip and with one inverted with respect to the other two.

10. The method ofmaking core laminae whichf'comprises feeding a metallic strip be tween the dies of a press and simultaneously punching upon the successive strokes of the press three E-shaped laminas with one in in-` verted central position with respect to the other two and with an oblong opening on each side of the opening formed by the punching of the inverted lamination and parallel with the legs thereof. i

ffll. In combination, a die having three E-shaped die openings, one inverted relative to the other and having'4 its base parallel with Land adjacent the bases of the other two and its outer legs of widths equal to the widths of the spaces between the central and inner 'legs of the other two die openings and aligned therewith and its central leg of a width equal to the width of the space between the inner legs of the other two die openings "and aligned therewith and a cooperating die having complementary die portions movable into and out of the dieV openings of said firstdie.

12. In combination, a die having three E-shaped die openings, one inverted relative thepther and having its base parallel with and adjacent the basesof the other two and its outer legsof widths equal to the widths of the spaces between the central and inner legs of the other two die openings and aligned therewith and its central leg of a width equal to the width of the space between the inner `legs `of the other two die openings and aligned therewith, a cooperating die having complementary die portions movahle into and out of the die opentween the dies and 1mnoh means for forming an opening oooperable with said aligning means 13. In c die openm upon Cooperation of said dies. ombination, a first die having a g7 a second tion movable into and out of said opening,

means for feeding a metallic strip between die having a die pore my name this 10th dav said dies, aligning means for aligning and 10 holding said strip in place and punch means aligned with said aligning means in the path of travel of said strip for punching openings in the strip for cooperation With said aligning means.

In Witness whereof,

i5 hereunto subscribe v of October, 1926. JAMES C. DALEY. 

